The honest timeline
- Unopened — best within 6–12 months of production, stored cool and dark.
- Opened — at its peak for 4–8 weeks; aim to finish within two months.
- Whisked — a prepared bowl is best within minutes; it does not keep.
Signs your matcha has aged
Trust your senses. Faded, yellow-olive color is the first flag. A flat or hay-like aroma is the second. In the cup, aged matcha tastes duller and more bitter, with the sweetness gone from the finish.
Aged matcha is not unsafe — just diminished. It still works in lattes, baking, and smoothies, where milk and sweetness cover its losses.
Buy less, more often — freshness is a habit, not a feature.
Best practices
Buy tin sizes you can realistically finish in a month or two. Note the date you open each tin. Store it sealed, cool, and dark, and let refrigerated tins warm before opening.
A 30–40 g tin suits a daily drinker better than a large pouch that lingers for half a year.